I know you said no service change but I use this Tidal client which works really well and goes up to 24-bit 192 kHz: https://github.com/Mastermindzh/tidal-hifi
I also download FLACs from Tidal, Deezer or Qobuz. You can find downloaders for them very easily.
Do you mean for downloading or for streaming? I use the normal Tidal app which already does the highest quality. Not the best app in the world but it does the job and I mostly listen to downloaded music anyway.